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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 690 · 40 questions
TalentJR

How to do it in your head (Make 10): Bonds to 10: 1 + 9, 2 + 8, 3 + 7, 4 + 6, 5 + 5. Bonds to 100: the ones make 10, and the tens make 9 (because the ones already gave one ten). If the number ends in 0, the tens make 10: 40 + 60 = 100.

NameDateTime takenScore ___ / 40
  1. 1.9 + ? = 10
  2. 2.4 + ? = 10
  3. 3.17 + ? = 100
  4. 4.37 + ? = 100
  5. 5.28 + ? = 100
  6. 6.63 + ? = 100
  7. 7.26 + ? = 100
  8. 8.52 + ? = 100
  9. 9.40 + ? = 100
  10. 10.8 + ? = 10
  11. 11.2 + ? = 10
  12. 12.5 + ? = 10
  13. 13.6 + ? = 10
  14. 14.74 + ? = 100
  15. 15.71 + ? = 100
  16. 16.68 + ? = 100
  17. 17.65 + ? = 100
  18. 18.3 + ? = 10
  19. 19.32 + ? = 100
  20. 20.38 + ? = 100
  21. 21.22 + ? = 100
  22. 22.7 + ? = 10
  23. 23.88 + ? = 100
  24. 24.45 + ? = 100
  25. 25.11 + ? = 100
  26. 26.35 + ? = 100
  27. 27.15 + ? = 100
  28. 28.33 + ? = 100
  29. 29.87 + ? = 100
  30. 30.85 + ? = 100
  31. 31.58 + ? = 100
  32. 32.39 + ? = 100
  33. 33.18 + ? = 100
  34. 34.61 + ? = 100
  35. 35.66 + ? = 100
  36. 36.36 + ? = 100
  37. 37.55 + ? = 100
  38. 38.29 + ? = 100
  39. 39.7 + ? = 10
  40. 40.16 + ? = 100

Answer key

  1. 1
  2. 6
  3. 83
  4. 63
  5. 72
  6. 37
  7. 74
  8. 48
  9. 60
  10. 2
  11. 8
  12. 5
  13. 4
  14. 26
  15. 29
  16. 32
  17. 35
  18. 7
  19. 68
  20. 62
  21. 78
  22. 3
  23. 12
  24. 55
  25. 89
  26. 65
  27. 85
  28. 67
  29. 13
  30. 15
  31. 42
  32. 61
  33. 82
  34. 39
  35. 34
  36. 64
  37. 45
  38. 71
  39. 3
  40. 84

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